Henry collinson



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'HENRY COLLINSON, 0F DORCIIESTER, ASSIGNOR T0 HIMSELF AND N. M.

HAZEN, or ANDovna, MASSAGHUSETTS.

Lasers Patent No. 99.640. dated February s, 1ero'.

IMPROVEMENT IN GRATE-BARS Mps- The Schedule referred to in these LettersPatent and making part of the same.

To all whom it mar/y concern:

p Be it known .that I, HENRY CoLLINsoN, of Dorchester, in the county ofNorfolk, and State of Massacllusetts,1 have invented certain new anduseful Ixnprovements in Furnace-Grates; and I do hereby del 4 To enableothers skilled in the art to construct and use my invention, I willproceed to describe it.

Myinvcntion relates to grates for furnaces; and The invention consistsin a novel manner of constructing the same, whereby one part can beoperated independent of the rest, and a part or the whole can be removedor replaced at pleasure, without disturb- -ng` the-brick-work of thefurnace, as hereinafter more fully explained.

Figure l is a top plan view of a furnace-grate, on my plan;

Figure 2 is a cross-section on the line x-z of iig. 1;

Figuref, a similar View ou the line z-'z of iig. l; and

Figure 4 are viewsl of the pieces composing the frame, detached.

'lhe ordinary method of constructing furnace-grates forlocomotives,steamboats, and steam-engines, is to make the whole gratestationary, the bars being detachable, but 'not otherwise movable, sothat when it is desiredto clear or clean the grate, it becomesnec-lessary, generally, to open the furnace-doors, thus admitting adraught'of cold' air, which .lowers the tempelature, and thereby thepressure of the steam.

When brick-work is used, it is also customary to set the frame in'thesame, in such a manner, that when it is desired to change the same, moreor less of the brick-work has to be torn away, and then rebuilt.

It is to remedy these diculties that my invention is designed; and toaccomplish that object, I make thegrate proper of a series of frames orsections, D, rectangular in form, with journals at each end, so thatthey may be hung in a frame, in such a manner as to permit them to berocked or shaken, tilted or tipped.

These frames D may' be cast with recesses in their end-pieces, asrepresented at c, fig. 3, 'so that the bars e may rest loosely therein,to .permit them to expand or contract without injury to the 'amesD, andalso lto be replaced when necessary.

These flames D, I make with a pendent or arm, I, at one end, Vso thatany desired number of them may vbe connected by/ rods or bars o, asrepresented in figs.'

'2 and 3.

I divide the grate into two or more sections, according to its size,-au`d iu each section or part I mount a when desired.

series, two or more of the frames, D, with their bars e, inserted asrepresented in iig. 1. i

All the frames D in one part, I connect by a rod or bar, O, underneath,and the end of this lrod O, I counect by another rod, f, to a level', L,located outside of the furnace, so that by means of the lever all theframes or sections in one part of the grate may' be shaken or tilted,without opening the furnace-door, or disturbing those in the other part.

There may be any number of such parts or divis ions in the furnace, eachseries of Isections or frames D in the separate parts being connectedand provided l with a separate lever, L.

To support these sections or frames, I construct the main frame of twoormore bars, B, the'ends of which rest loosely in suitable recesses madefor them in the walls ofthe furnace, as representedl by No. l, fig. 4.The recesses in the walls are deep enough to allow the bar B to move lonThese bars B, being formedwith recesses or notches provided withcircular'recesses or notches, for the reception ot' the journals offrames'` D, the main frame is thus composed of a series of independentbars, each and allof which can bei removed or replaced at pleasure,without injuring or removing the'brick-work, and which also Apermits thevarious zparts to expand and contract without injury.

Any form of grate-bars may be used with .this arrangement. Inthis case Ihave represented the ordinary plain bar, one being shown detached, atNo. 4of tig. 4, although it isobvious that'any other style may be usedequally well. l

This plan of constructing and operating grates may be applied to allkinds of furnaces, its advantages being obvious to any one familiar withthe subject of grates, as ordinarily used in furnaces.

Having thus described` my invention,

What I claim, is-

1.l A furnacefrate, consisting of two or more sections or nest-s o fframes, each of the frames being provided with loosely-fittinggrate-bars, and so journalled and connected with the frames of the samesection,

gitudi'nally,'so asto be removed

